re PR debug/87295 ([early debug] ICE with -ffat-lto-objects -fdebug-types-section -g)

2019-02-03  Richard Biener  <rguenther@suse.de>

	PR debug/87295
	* dwarf2out.c (copy_ancestor_tree): Register non-stubs as
	orig.

	* g++.dg/debug/dwarf2/pr87295.C: New testcase.

From-SVN: r268485

gcc/ChangeLog

+2019-02-03  Richard Biener  <rguenther@suse.de>
+
+	PR debug/87295
+	* dwarf2out.c (copy_ancestor_tree): Register non-stubs as
+	orig.
+
 2019-02-02  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/87887

gcc/dwarf2out.c

@@ -8169,6 +8169,11 @@ copy_ancestor_tree (dw_die_ref unit, dw_die_ref die,
   decl_table_entry **slot = NULL;
   struct decl_table_entry *entry = NULL;
 
+  /* If DIE refers to a stub unfold that so we get the appropriate
+     DIE registered as orig in decl_table.  */
+  if (dw_die_ref c = get_AT_ref (die, DW_AT_signature))
+    die = c;
+
   if (decl_table)
     {
       /* Check if the entry has already been copied to UNIT.  */

gcc/testsuite/ChangeLog

+2019-02-03  Richard Biener  <rguenther@suse.de>
+
+	PR debug/87295
+	* g++.dg/debug/dwarf2/pr87295.C: New testcase.
+
 2019-02-02  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/88298

gcc/testsuite/g++.dg/debug/dwarf2/pr87295.C

+// { dg-additional-options "-fdebug-types-section" }
+// { dg-require-effective-target c++11 }
+
+struct A {};
+namespace N {
+    struct B {
+	using C = struct H {};
+	using D = A;
+    };
+}
+struct E : N::B {
+    typedef C C;
+};
+namespace N {
+    struct F {
+	E::C d;
+	E::D h;
+    };
+}
+struct G {
+    N::F i;
+} j;